When two absolute values are equal to each other, you can square both sides , because no matter it is positive or negative, you will have a POSITIVE result.erukumk wrote:for statement 1: can you tell me why did you square on both sides??logitech wrote:Question can be paraphrased as:erukumk wrote:is |X| < 1?
1) |X+1|=2|X-1|
2)|X-3|!=0
Is X between -1 and + 1 ?
1) |X+1|=2|X-1|
if we take the square of both side and re-arrange it:
3X^2 - 10X + 3 = 0
X = 1/3 or X = 3
INSUF
2) IX-3|!=0
|X-3|!=0 , 0! = 0
Means that X=3
3 is not between -1 and + 1
Sufficient
Hence, B
LGTCH
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